iPhone Ownership Massive During Travels

During my recent travels, the iPhone is so prevelant that it seems other phones do not exist at the moment. It seems their value extends past a certain age group or generation, as I see them used by teenagers, young professionals, middle age and senior professionals in the european countries I´ve recently seen. Their appeal for customization in music, apps and internet raises the question what would potentially eclipse this product in the future? It´s amazing their reach at the moment.